[ noun, adjective doo-pli-kit, dyoo-; verb doo-pli-keyt, dyoo- ]
See synonyms for: duplicateduplicatedduplicating on Thesaurus.com

  1. a copy exactly like an original.

  2. anything corresponding in all respects to something else.

  1. Cards. a duplicate game.

verb (used with object),du·pli·cat·ed, du·pli·cat·ing.
  1. to make an exact copy of.

  2. to do or perform again; repeat: He duplicated his father's way of standing with his hands in his pockets.

  1. to double; make twofold.

verb (used without object),du·pli·cat·ed, du·pli·cat·ing.
  1. to become duplicate.

  1. exactly like or corresponding to something else: duplicate copies of a letter.

  2. consisting of or existing in two identical or corresponding parts; double.

  1. Cards. noting a game in which each team plays a series of identical hands, the winner being the team making the best total score.

Idioms about duplicate

  1. in duplicate, in two copies, especially two identical copies: Please type the letter in duplicate.

Origin of duplicate

First recorded in 1400–50; late Middle English, from Latin duplicātus (past participle of duplicāre “to make double”), equivalent to duplic- (stem of duplex ) duplex + -ātus -ate1

synonym study For duplicate

4. See imitate.

Other words for duplicate

Opposites for duplicate

Other words from duplicate

  • du·pli·ca·tive, adjective
  • non·du·pli·cat·ing, adjective
  • pre·du·pli·cate, verb (used with object), pre·du·pli·cat·ed, pre·du·pli·cat·ing.
  • qua·si-du·pli·cate, adjective
  • self·-du·pli·cat·ing, adjective
  • un·du·pli·cat·ed, adjective

Words Nearby duplicate

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use duplicate in a sentence

British Dictionary definitions for duplicate


  1. copied exactly from an original

  2. identical

  1. existing as a pair or in pairs; twofold

  1. an exact copy; double

  2. something additional or supplementary of the same kind

  1. two exact copies (esp in the phrase in duplicate)

  1. (tr) to make a replica of

  2. (tr) to do or make again

  1. (tr) to make in a pair; make double

  2. (intr) biology to reproduce by dividing into two identical parts: the chromosomes duplicated in mitosis

Origin of duplicate

C15: from Latin duplicāre to double, from duo two + plicāre to fold

Derived forms of duplicate

  • duplicable (ˈdjuːplɪkəbəl), adjective
  • duplicability, noun
  • duplicately, adverb
  • duplicative, adjective

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012